JPS61224537A - Transmission right managing system of ring network - Google Patents

Abstract

PURPOSE:To avoid competition of recovery processing at missing token on plural nodes by setting individually a timeout value of a transmission right supervisory timer detecting missing token of each node on a network. CONSTITUTION:At node leading, a microprocessor 3 uses an interface circuit 4 to issue a transfer request of timeout value of a transmission right supervisory timer to a host device. The microprocessor 3 sets the timeout value sent from the host device to a register 6 based on the transfer request. A value different depending on each node is given by the host device as the timeout value. A transmission right timeout detection circuit 7 discriminates whether or not a token exists in a data from a receiver 1 and counts up a timer 8 for a prescribed period while no token is detected. At detection of a token, the timer 8 is reset and restarted. When the value of the timer 8 and the content of the register 6 are coincident, a transmission right timeout detection circuit 6 reports the transmission right timeout to the microprocessor 3. Thus, the microprocessor 3 constitutes the token and sends it to a ring network through a transmitter 2.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a ring network transmission right management method % [Background of the Invention] Transmission right management using a token passing method in a peer-to-peer communication type ring network without a master node. When doing so, there was a problem in that multiple nodes competed in the recovery process when a token was lost. Typically, the recovery process involves a valley node creating a token and sending it out onto the ring network. Therefore, if a plurality of nodes simultaneously detect the loss of a token and perform recovery processing, the plurality of tokens will circulate on the ring network, causing a secondary failure.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission right management system that eliminates the above-mentioned problems and avoids conflicts among multiple nodes in recovery processing when a token is lost.

[Summary of the invention]

In the present invention, each node on the ring network has a transmission right monitoring timer timeout @
1-! It is characterized by being set to (by l).

[Embodiments of the invention]

Examples of the present invention will be described below.

FIG. 1 shows the configuration of a node to which the present invention is applied.

1 is a ring network receiver, 2 is a transmitter, 3 is a microprocessor that controls the node, 4 is an interface circuit with a host device, and 5 is D indicating a node address.
An IP switch, 6 a register for a timeout value, 7 a transmission right timeout detection circuit, and 8 a timer. When the node is started up, the microprocessor 3 uses the interface circuit 4 to issue a request to the host device to transfer the timeout value of the transmission right monitoring timer. Based on this transfer request, the microprocessor 3 sets in the register 6 the timeout value sent from the host device. The timeout value is given by the host device as a different value depending on the node. The transmission right timeout detection circuit 7 determines whether or not there is a token in the data from the receiver 1, and clocks up the timer 8 at a constant cycle while no token is detected. When a token is detected, the timer 8 is reset and restarted.

When the value of the timer 8 and the value of the register 6 match, the transmission right timeout detection circuit 6 reports the transmission right timeout to the microprocessor 3.

As a result, the microprocessor 3 executes the transmission right recovery processing routine shown in FIG. 3, forms a token, and sends it to the ring network through the transmitter 2.

FIG. 2 shows a ring network using nodes having the configuration shown in FIG. 10 to 15 indicate valley nodes. On the ring, node 15 sends out a token, and nodes 12 and 1
If the token is lost within 3, the node with the shortest timeout value will detect the transmission right timeout first, construct a token, and send it out onto the ring network. If the difference between the timeout values at the valley nodes is set to be larger than the time required for the transmission right recovery operation of a node, a plurality of nodes will not detect a transmission right timeout.

〔Effect of the invention〕

According to the present invention, the following effects can be obtained.

Since it is possible to avoid performing recovery processing on multiple nodes when a token is lost, secondary failures due to multiple tokens can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a node which is an embodiment of the present invention, and the second figure shows a ring network which is an embodiment of the present invention. FIG. 3 shows a recovery processing routine when the transmission right monitoring timer times out. 1... Receiver 2... Transmitter 3... Microprocessor 4... Interface circuit 5... DIP switch for node address 6... Register for timeout value 7... Transmission right timeout detection circuit 8... Timer 10... Node (node address 1o) 11... Node (node address 11) 12... Node (node address 12.) 13... Node (node address 1)
3) 14... Node (node address 14) 15...
・Node (node address 15) 16-21... Upper device, ) 1\゛,ノJtrfJ Figure 2

Claims (1)

[Claims] In a peer-to-peer traffic ring network that uses the token passing method, by setting an individual timeout value for the transmission right monitoring timer of each node, it is possible to avoid competing recovery processes among multiple nodes when a token is lost. A transmission right management method for a ring network.